RM35X0E _57 Power Source / Network _078518 NETWORKING _0396952 CXPI COMMUNICATION SYSTEM C

NETWORKING  CXPI COMMUNICATION SYSTEM  B12A0  Lost Communication with Illumination Module "A"  B12A1  Lost Communication with Illumination Module "B"  


DESCRIPTION

This DTC is stored when CXPI communication between the room light control relay and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B12A0 Lost Communication with Illumination Module "A" No communication between main body ECU (multiplex network body ECU) and room light control relay (for Front Side) for 10 seconds or more
·

Main body ECU (multiplex network body ECU)

·

Room light control relay (for Front Side)

·

Harness or connector


B12A1 Lost Communication with Illumination Module "B" No communication between main body ECU (multiplex network body ECU) and room light control relay (for Rear Side) for 10 seconds or more
·

Main body ECU (multiplex network body ECU)

·

Room light control relay (for Rear Side)

·

Harness or connector



WIRING DIAGRAM

C418711E01
0.156,1.74 0.615,1.938 0.458,0.198 10 false N18 0.156,1.906 1.833,2.333 1.677,0.427 10 false Main Body ECU (Multiplex Network Body ECU) 1,1.406 1.458,1.604 0.458,0.198 10 false CXP2 1.458,1.219 1.917,1.417 0.458,0.198 10 false 11 3.24,2.125 3.698,2.323 0.458,0.198 10 false N148 3.229,2.271 5.885,2.552 2.656,0.281 10 false Room Light Control Relay (for Front Side) 3.479,1.698 3.938,1.896 0.458,0.198 10 false 9 3.698,1.802 4.156,2 0.458,0.198 10 false E 3.708,0.885 4.167,1.083 0.458,0.198 10 false B 3.49,0.76 3.948,0.958 0.458,0.198 10 false 7 3.698,1.396 4.156,1.594 0.458,0.198 10 false CXPI 3.438,1.25 3.896,1.448 0.458,0.198 10 false 10 5.24,1.375 6.75,1.677 1.51,0.302 10 false to Reading Light Circuit 4.896,0.417 6.156,0.75 1.26,0.333 10 false from Battery 3.719,0.281 4.656,0.563 0.938,0.281 10 false DOME NO.1 4.917,3.177 6.177,3.51 1.26,0.333 10 false from Battery 3.677,3.021 4.615,3.281 0.938,0.26 10 false DOME NO.1 3.698,4.188 4.156,4.385 0.458,0.198 10 false CXPI 3.708,4.583 4.167,4.781 0.458,0.198 10 false BU- 3.49,4.438 3.948,4.635 0.458,0.198 10 false 9 3.417,4.031 3.875,4.229 0.458,0.198 10 false 10 3.49,3.531 3.948,3.729 0.458,0.198 10 false 7 3.708,3.656 4.167,3.854 0.458,0.198 10 false BU+ 5.24,4.177 6.417,4.667 1.177,0.49 10 false to Door Trim Light Circuit 0.427,2.813 2.26,3.333 1.833,0.521 12 false w/ Door Trim Illumination (for 3 Colors Type): 0.813,6.448 2.74,6.813 1.927,0.365 10 false : CXPI Communication Line 3.333,4.875 3.792,5.073 0.458,0.198 10 false V33 3.333,5.073 5.99,5.354 2.656,0.281 10 false Room Light Control Relay (for Rear Side)

CAUTION / NOTICE / HINT

NOTICE:
·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

·

If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

·

When disconnecting and reconnecting the battery.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>WORK PROCEDURE

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART


·

Some parts must be initialized and set when replacing or removing and installing parts.

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>WORK PROCEDURE



PROCEDURE

1.CHECK FOR DTC
a.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>CXPI COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

b.

Check for DTCs.

Click herePower Source / Network>NETWORKING>CXPI COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes
50001 123

Result:
Result Proceed to
DTC B12A0 and B12A1 are output A
DTC B12A0 is output B
DTC B12A1 is output C



A

2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - ROOM LIGHT CONTROL RELAY [for Front Side])

B

3.CHECK HARNESS AND CONNECTOR (ROOM LIGHT CONTROL RELAY [for Front Side] POWER SOURCE CIRCUIT)

C

5.CHECK HARNESS AND CONNECTOR (ROOM LIGHT CONTROL RELAY [for Rear Side] POWER SOURCE CIRCUIT)
2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - ROOM LIGHT CONTROL RELAY [for Front Side])
a.

Disconnect the cable from the negative (-) battery terminal.


b.

Disconnect the N148 room light control relay (for Front Side) connector.


c.

Disconnect the V33 room light control relay (for Rear Side) connector.


d.

Disconnect the N18 main body ECU (multiplex network body ECU) connector.


e.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N148-10 (CXPI) - N18-11 (CXP2) Cable disconnected from negative (-) battery terminal Below 1 Ω
N148-10 (CXPI) - Body ground Cable disconnected from negative (-) battery terminal 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD: Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD: Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK HARNESS AND CONNECTOR (ROOM LIGHT CONTROL RELAY [for Front Side] POWER SOURCE CIRCUIT)
a.
C368242C52
1.417,0.24 1.958,0.458 0.542,0.219 2.24,1.115 2.042,1.885 2.042,1.885 2.208,1.885 true 2.479,1.115 2.583,0.406 2.583,0.406 2.75,0.406 true 1.563,0.281 2.021,0.479 0.458,0.198 10 false N148 2.813,0.323 3.271,0.521 0.458,0.198 10 false E 2.292,1.823 2.75,2.021 0.458,0.198 10 false B 0.073,0.042 0.531,0.24 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Room Light Control Relay [for Front Side])


Disconnect the room light control relay (for Front Side) connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N148-9 (E) - Body ground Always Below 1 Ω



c.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
N148-7 (B) - Body ground Always 10 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - ROOM LIGHT CONTROL RELAY [for Front Side])

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - ROOM LIGHT CONTROL RELAY [for Front Side])
a.

Turn the ignition switch off.


b.

Disconnect the cable from the negative (-) battery terminal.


c.

Disconnect the N18 main body ECU (multiplex network body ECU) connector.


d.

Disconnect the N148 room light control relay (for Front Side) connector.


e.

w/ Door Trim Illumination (for 3 Colors Type):

Disconnect the V33 room light control relay (for Rear Side) connector.


f.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N148-10 (CXPI) - N18-11 (CXP2) Cable disconnected from negative (-) battery terminal Below 1 Ω
N148-10 (CXPI) - Body ground Cable disconnected from negative (-) battery terminal 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ROOM LIGHT CONTROL RELAY (for Front Side)

Click hereVehicle Interior>LIGHTING (INT)>ILLUMINATION ECU (for Front Side)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (ROOM LIGHT CONTROL RELAY [for Rear Side] POWER SOURCE CIRCUIT)
a.
C368242C51
1.417,0.24 1.958,0.458 0.542,0.219 2.24,1.115 2.042,1.885 2.042,1.885 2.208,1.885 true 2.479,1.115 2.583,0.406 2.583,0.406 2.75,0.406 true 1.563,0.281 2.021,0.479 0.458,0.198 10 false V33 2.813,0.323 3.271,0.521 0.458,0.198 10 false BU- 2.292,1.823 2.75,2.021 0.458,0.198 10 false BU+ 0.073,0.042 0.531,0.24 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Room Light Control Relay [for Rear Side])


Disconnect the room light control relay (for Rear Side) connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
V33-9 (BU-) - Body ground Always Below 1 Ω



c.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
V33-7 (BU+) - Body ground Always 10 to 14 V



Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - ROOM LIGHT CONTROL RELAY [for Rear Side])

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - ROOM LIGHT CONTROL RELAY [for Rear Side])
a.

Turn the ignition switch off.


b.

Disconnect the cable from the negative (-) battery terminal.


c.

Disconnect the N18 main body ECU (multiplex network body ECU) connector.


d.

Disconnect the N148 room light control relay (for Front Side) connector.


e.

Disconnect the V33 room light control relay (for Rear Side) connector.


f.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
V33-10 (CXPI) - N18-11 (CXP2) Cable disconnected from negative (-) battery terminal Below 1 Ω
V33-10 (CXPI) - Body ground Cable disconnected from negative (-) battery terminal 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ROOM LIGHT CONTROL RELAY (for Rear Side)

Click hereVehicle Interior>LIGHTING (INT)>ILLUMINATION ECU (for Rear Side)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR